Anthomyia malagasica, Ackland, 2001

Ackland, D. M., 2001, Revision of afrotropical Anthomyia Meigen, 1803 (Diptera: Anthomyiidae), with descriptions of ten new species, African Invertebrates 42, pp. 1-94 : 74-79

publication ID 10.5281/zenodo.7909758

persistent identifier

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scientific name

Anthomyia malagasica

sp. nov.

Anthomyia malagasica sp. n.

( Figs 172–180 View Figs 172–180 )

Holotype Ò: MADAGASCAR: ‘Holotype’ [circular white label with red perimeter]; ‘Perinet / Madagascar / xii.1955 / B. Stuckenberg’ [white printed rectangular label]; ‘ Holotype / Anthomyia Ò / malagasica / D. M. Ackland’ [red printed and written rectangular label]. Genitalia dissected and mounted in glycerol in a plastic tube on staging pin. In good condition, 3rd costal section of left wing missing. In NMSA.

Paratypes: MADAGASCAR: 2Ò, Madagascar Centre , dist. Ambatolampy, Manjakatompo, 1700 m, 11–15.xii.1957, B. Stuckenberg; 1Ò, Madagascar Centre, dist. Ambatolampy, Lac Froid, 1620 m, 11–15.xii.1957, B. Stuckenberg; 1Ò, Ambohitantely, no date, Lot No. 4 (ex Inst. Scient. Madagascar). All paratypes in NMSA .

Etymology: From Malagasy, the old name for Madagascar.

The following material contains those males which have smaller membranous lobes on the inner margin of processes of the 5th sternite (and smaller dorsal processes of the distal section of the aedeagus) than the type material; the females cannot be separated on external morphological characters, or associated with either the type material or with the males included in ‘other material’.As males of both forms were caught together in some localities, it is by no means certain that females with the same data labels are conspecific.

Other material examined: MADAGASCAR: 1Ò1^, dist.Ambatolampy, Manjakatompo, 1700 m, 11–15.xii.1957; 2^, same locality, forest station, i.1956; 2Ò1^, Ankaratra massif, Tsiafajavona Peak, i.1956; 1Ò, Andringitra-Ambalavoa, Plateau Soaindrana, 2060 m, 14–17.i.1958; 1Ò, dist. Ambatolampy, Col. Mahafompeno, 2400 m, 11– 15.xii.1957; 1^,Andringitra-Ambalavao, Vakoana, 1520 m, 21–24.i.1958; 1^, Perinet, xii.1955; 1^, Mt. d’Ambra, xii.1948; 1^, same locality, 23.xi–4.xii.1957; 1^, Moramanga dist., Niagarakely Forest, xii,1955; 1^, Ambohitantely, no date, (ex Inst. Scient. Madagascar); 1^, Madagascar Nord, Prairie de Listéres, Joffreville Diégo- Suarez, 840 m, 4.xii.1957. All material collected by B. Stuckenberg, and in NMSA.

Note on some of the localities kindly provided by Dr Stuckenberg: ‘Perinet, the type locality, is a railway station with a small associated town to the east of Moramanga, on the railway line between Antananarivo and the eastern seaport of Tamatave. It is within the main eastern escarpment rainforest, and is now a proclaimed nature reserve. The escarpment more or less parallels the eastern coastline, and forest used to extend all along it as a consequence of the high monsoonal rainfall. The railway encouraged logging activities in the Perinet area , and I suspect that much of the forest has been degraded since my visit in 1955 ’.


Colour: Interfrontalia, parafrontalia and genae varying from dark brown to blackish (with rather dense silvery dusting); parafrontals opposite lunule with a dark and rather persistent shifting sheen stripe which extends from level of lunule to level of arista (only shifting to silvery grey dusting in extreme dorsal view), and a wide brownish black non-shifting spot in vibrissal angle which extends above genal groove and reaches eye margin when viewed in profile; face and occiput blackish (with normal dusting), except upper part of occiput greyish. Antennae entirely dark brown. Palpi dark brown to black; prementum dark brown, thinly dusted and rather shining. Thorax ( Figs 172, 173 View Figs 172–180 ) densely dusted (over dark ground-colour) with contrasting black and silvery grey pattern on dorsal surface (the grey presutural dusting becomes a darker greasy grey when viewed from a low angle in front; a wide transverse postsutural band across the scutum complete between wing bases (but posterior margin rather strongly indented around 3rd postsutural dorsocentral seta (grey dusting around base of latter); presutural spots joined behind head, each spot laterally and posteriorly with a straight border, forming a V shape (inner margins reaching the presutural acrostichal setulae, posterior margins at level of 2nd presutural dorsocentrals); scutellum almost entirely black (with only its extreme tip silvery grey). Pleura grey dusted, lower part of the post pronotal lobes and anterior and posterior part of anepisternum brownish black.Abdomen largely densely dusted over dark ground-colour (occasionally tinged reddish or orange in parts), with contrasting black and grey pattern on tergites (black central vitta on 3rd and 4th tergite as wide as depth of femur, joined anteriorly to a black crossband on each tergite (about one-third length of tergite) and expands laterally to about half length of tergite; hypopygium and 5th sternite rather finely dusted, the latter reddish brown and shining in places. Wing membrane weakly brownish orange tinged; wing bases with pale brownish veins, stem vein whitish; squamae concolorous with extreme wing base, with whitish fringes; halteres yellow. Legs dark brown (except for the partly shining trochanters which are sometimes orange-brown).

Head: Parafrontalia very narrow posteriorly (almost touching for a distance equal to twice diameter of anterior ocellus), widening anteriorly to about width of first flagellomere; parafacial two-thirds width of first flagellomere; eyes separated by diameter of anterior ocellus; genae below lowest point of eye margin 0.37–0.37 times eye-height. 2 pairs of short parafrontal setae on anterior half of distance between antennal base and anterior ocellus; very short but distinct interfrontal setulae present. First flagellomere slightly more than twice as long as wide (apex not quite reaching lower facial margin); arista slightly swollen at base, about 1.8 times length of first flagellomere, short plumose, total width of hairing equal to about half width of first flagellomere. Prementum about 0.4 times as long as head height.

Thorax: 3–4 pairs of presutural acrostichals (the middle the longest) in rows separated by slightly more than distance from each to adjacent dorsocentral row, without additional setulae in between rows; acr / dc ratio 9:10:9; posthumerals 1 + 1; prealar about 1.5 times as long as posterior notopleural (the latter short and only three-quarters length of anterior notopleural seta); dorsal surface of scutellum without setulose hairs on disc, preapical discal setae half length of apicals; katepisternals 2 + 2, lower posterior nearly as long as upper posterior seta, lower anterior half length of upper anterior; anepisternum with a developed upper anterior setula.

Legs: of normal length. F2 with row of 4–6 pv (unequal in length) on about basal three-quarters (holotype with a strong av basally on left mid femur only); f3 with 8–10 strong av on whole length, and from 0–5 finer pv setae; t1 with 2 strong median pv in holotype, but other specimens with only 1; t2 with 1 strong ad, 2 pd and 2 p/pv; t3 with 1–2 av, 4 ad, 2 pd and 2–3 pv.

Wing: costa with marginal spinules short (not as long as diameter of costa,), the pair before distal break distinct but only about twice length of adjacent spinules; lower crossvein sinuate, joining M 1+2 obliquely; last section of M 1+2 1.5 times length of preceding section. Lower squama nearly as long as upper.

Wing length up to 5.5 mm.

Abdomen: as long as thorax (2.5 times as long as wide, parallel-sided), in lateral view dorsoventrally compressed in basal two-thirds. 4th sternite ( Fig. 176 View Figs 172–180 ) 2.5 times as long as wide, rectangular, with long lateral setae and shorter discal setulae, without denser setae on posterior margin. 5th sternite processes ( Figs 176, 177 View Figs 172–180 ) with 4–7 setae laterally at their bases, otherwise with moderately long uni-biserial rows of setulae on their concave inner margins and 2–3 rather long setae apically; membranous lobes ( Fig. 177 View Figs 172–180 ) moderately projecting ventrally in lateral view, with posterior margins at right angles to the apical part of processes. Central process of synsternite (6+7) ( Fig. 179 View Figs 172–180 ) with divergent winged arms. Surstylus ( Fig. 175 View Figs 172–180 ) downcurved, slightly constricted medially in lateral view, upper dorsal margin with a small developed lobe. Cercal plate ( Fig. 174 View Figs 172–180 ) of about equal length and width, with 4 short expanded apical spinules which are arranged with one pair below the other, and 1 pair of longer setulae on either side of them, otherwise setulose only on basal half, in profile apex slightly projecting at right angles, not concealed behind surstylus. Pregonite ( Fig. 178 View Figs 172–180 ) slightly longer than wide, with 2 setulae on oblique distal margin; postgonite with a rather long anteroventral setula which arises from a small tubercle, (anteroventral margin indented beyond setula); distal section of aedeagus ( Fig. 179 View Figs 172–180 ) with a long proclinate dorsal process separated from its base by one-third its length.

Female: Not identified with certainty.A female from the type locality of Perinet (without head) has the same scutal pattern as the holotype. Of the eleven females listed in ‘other material’ those from Montagne d’Ambre (1^), Manjakatompo (2^), Prairie de listéres (1^), have 2 av on the hind tibia and 2 ad on the fore tibia; the other female from Manjakatompo has only 1 seta on each of these legs.The same variation in leg chaetotaxy occurs in the males .

Discussion: The material from Madagascar can be divided into two segregates in the male sex. The name malagasica is restricted to the specimens where the membranous lobe on the processes of the 5th sternite are larger, with longer setae on the inner basal margins of the processes, and with the distal angle between the lobe and the process being more acute (angle about 90º (posterior margin of lobe often very membranous and jagged); a long and strong dorsal projection on the distal section of the aedeagus is also present.

The other segregate ( Figs 181–187 View Figs 181–187 ), which has a smaller membranous lobe ( Fig. 182 View Figs 181–187 ), shorter setae on the inner margins of processes ( Fig. 189 View Figs 188–199 ), and a reduced dorsal process on the distal section of the aedeagus, is listed as ‘other material’, together with all females.

A. malagasica bears a considerable resemblance to acutula sp. n. from Kenya and southern Africa. In acutula the membranous lobes on the 5th sternite are slightly larger than malagasica , and the distal margins also form a right angle to the processes, and the latter bear equally long setae; the distal section of the aedeagus in acutula however lacks a dorsal projection on the distal section. The cercal plate in acutula also has a longer projecting apex (especially in lateral view). A. malagasica is also closely related to abyssinica , but the aristal hairing in malagasica is about one-third to one-half the width of the first flagellomere (in abyssinica three-quarters to fully that width), and the costal spine in malagasica is shorter.

There is no information on the habits or life history of malagasica .

Distribution: Madagascar.













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